Back
CVE-2016-5696
net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier…
Medium4.8EPSS 14.5%
- Published
- Updated
- Reserved
- Assigned by
- mitre
Description
net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hijack TCP sessions via a blind in-window attack.
Timeline
ID reserved
By mitre
- 51 days later
· 51 days later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Medium4.8 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
- EPSS (exploitation in 30 days)
- 14.5% · top 3.3% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.8.
Weakness
Affected products
n/a
- affected n/a
References (32)
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/Gnoxter/mountain_goat (opens in a new tab)x_refsource_MISCx_transferred
- USN-3070-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- RHSA-2016:1657 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://bto.bluecoat.com/security-advisory/sa131 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- RHSA-2016:1814 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://kc.mcafee.com/corporate/index?page=content&id=SB10167 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://source.android.com/security/bulletin/2016-10-01.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- 91704 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- USN-3070-3 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-3070-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- RHSA-2016:1815 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2016:1939 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- USN-3071-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- RHSA-2016:1632 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf (opens in a new tab)x_refsource_MISCx_transferred
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758 (opens in a new tab)x_refsource_CONFIRMx_transferred
- USN-3070-4 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- 1036625 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- RHSA-2016:1631 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=1354708 (opens in a new tab)x_refsource_CONFIRMx_transferred
- USN-3072-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- RHSA-2016:1633 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2016:1664 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- USN-3072-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html (opens in a new tab)x_refsource_MISCx_transferred
- [oss-security] 20160712 Re: CVE-2016-5389: linux kernel - challange ack information leak. (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- USN-3071-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- https://security.paloaltonetworks.com/CVE-2016-5696 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.arista.com/en/support/advisories-notices/security-advisories/1461-security-advisory-23 (opens in a new tab)x_refsource_MISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-5696)Record last updated .